Evaluation methods and statistics The measurements of each scoring systems were described in the average standard deviation in order to examine the effect of PRP for the pain caused by intra-articular cartilage injuries, and SPSS (version 12.0) was used for the statistical analysis. The Visual Analogue Scale (VAS), Lysholm Knee Scale, and the Cincinnati Knee Rating System were tested using Repeated Measure ANOVA and it was considered as significant when the p values were less than 0.05.